kentkwu opened a new pull request, #334:
URL: https://github.com/apache/arrow-js/pull/334
## What's Changed
Summary:
- Added `Field.withMetadata()` and `Schema.withMetadata()` so callers can
replace or clear metadata maps without manually juggling Map<string,string>
instances. Both helpers accept either a Map, a plain object, or null (to
clear), and always return a new instance, matching the C++/PyArrow/Rust
behavior.
- Added `test/unit/schema-tests.ts` with coverage for the new helpers. I
couldn't find a better place to put these but let me know if I missed something.
Closes https://github.com/apache/arrow-js/issues/333
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